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The element with atomic configuration 2 8 1 is sodium (Na) ; and element with atomic configuration 2 8 7 is chlorine (Cl)
sodium is 1 electron more for octet configuration and chlorine is 1 electron deficient for octet so they form an ionic bond by the transfer of electron from sodium to chlorine forming an inoic compound NaCl.
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Element A is Sodium and element B is Chlorine
Formed compound formula =Nacl
The bond is ionic bond
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